I’ve been in the reefing hobby for 6 years now, and have discovered something I’ve never seen. I finished building my 32 gallon brute trash can mixing station 4 days ago and cleaned it thoroughly to get rid of all the impurities. The salt water has been mixing for 4ish days and built up this speckled film the surface and I don’t know if it’s harmful or not. My rodi water is 0 tds and I use fritz salt (red box) I’ve been Mixing this brand salt for 2 years consistently and haven’t seen this before. Any ideas?